The word lamellibranch is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 28
Highest Scoring Words With Friends™ Play In The Letters lamellibranch
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Seven Letter Word Alert: (60 words)
achiral, aclinal, airable, aircell, albinal, allelic, amiable, anaemic, archeal, archean, balance, balmier, banaler, bellman, billman, billmen, brachia, brahmin, braille, caliber, calibre, cambial, caramel, carbine, carinae, carinal, carmine, chainer, chamber, chiller, chimera, claimer, clamber, climber, crabman, cranial, helical, hernial, iceball, inhaler, inreach, lamella, laminae, laminal, laminar, liberal, macabre, machine, mailcar, manacle, manilla, manlier, micella, mineral, miracle, nimbler, rechain, rechill, reclaim, reclimb